CN115900401A - Heat Exchanger - Google Patents

Abstract

The invention discloses a heat exchanger, comprising: the shell is provided with a third flow passage, and the third flow passage is used for providing a third working medium as a cold source; the first heat exchange core group and the second heat exchange core group are arranged in the shell in a deviating mode, the first heat exchange core group is provided with a first flow channel, the first flow channel is used for providing a first working medium as a heat source, the second heat exchange core group is provided with a second flow channel, and the second flow channel is used for providing a second working medium as a heat source; the third flow channel is respectively arranged at intervals with the first flow channel and the second flow channel; the flow direction of the third working medium in the third flow channel is opposite to the flow direction of the first working medium in the first flow channel and the flow direction of the second working medium in the second flow channel respectively; the heat exchanger utilizes the third working medium to fully cool the first working medium and the second working medium, thereby achieving the purpose of utilizing the cooling working medium to exchange heat with the high-temperature working medium.

Description

Heat Exchanger

technical field

The invention relates to the technical field of heat exchangers, in particular to a heat exchanger.

Background technique

Existing vehicle and ship power system heat exchangers, such as lubricating oil coolers and fuel oil radiators, are mostly shell-and-tube heat exchangers and plate heat exchangers, which are large in size and single in function. With the development of vehicle and ship power systems towards modularization and the improvement of equipment integration, the requirements for the size, weight and reliability of the heat exchangers used are also increasing. Traditional shell-and-tube and plate heat exchangers will no longer be applicable. High-efficiency and multi-purpose heat exchangers have gradually been widely used in marine and vehicle power systems due to their advantages of multiple heat exchange functions, high heat transfer efficiency, small footprint, and light weight. The heat exchangers in the power system of ships and amphibious vehicles mostly use seawater as the cooling medium. Seawater is highly corrosive. After being used for a long time in seawater, heat exchangers made of general materials (such as stainless steel) are prone to corrosion and leakage problems, reducing power System reliability and security.

Contents of the invention

The invention provides a heat exchanger, which is used to solve the problem that the heat exchanger of the power system of ships and amphibious vehicles is prone to corrosion and leakage after being used for a long time in seawater environment.

The present invention provides a heat exchanger, comprising: a housing, a third flow channel is arranged in the housing, and the third flow channel is used to provide a third working fluid as a cooling source; The first heat exchange core group and the second heat exchange core group in the body, the first heat exchange core group is provided with a first flow channel, the first flow channel is used to provide the first working fluid as a heat source, and the second heat exchange core group The thermal core set is provided with a second flow channel, and the second flow channel is used to provide a second working fluid as a heat source; wherein, the third flow channel is spaced apart from the first flow channel and the second flow channel respectively ; The flow direction of the third working fluid in the third flow channel is opposite to the flow direction of the first working fluid in the first flow channel and the flow direction of the second working fluid in the second flow channel.

In some embodiments, any one of the first heat exchanging core group and the second heat exchanging core group includes a plurality of heat exchanging chips stacked along the first direction, and the adjacent heat exchanging chips An outer fin and two outer spacers are arranged between them, and the outer spacer is arranged at intervals on both sides of the outer fin along the second direction, and the first heat exchange core set and the second heat exchange core set The sides facing away from each other are respectively provided with flanges, and the sides of the first heat exchange core group and the second heat exchange core group are respectively provided with end covers.

In some embodiments, the housing includes two first side plates spaced apart along the first direction, two second side plates spaced apart along the second direction, and two second side plates spaced apart along the third direction. Three side plates, two of the first side plates, two of the second side plates and two of the third side plates enclose to form a hollow structure; wherein, the first direction, the second direction and the first direction Two of the three directions are perpendicular to each other; and, the first heat exchange core group and the second heat exchange core group are arranged between the two first side plates, and the outside of the first heat exchange core group, the The outside of the second heat exchange core group is surrounded by the hollow structure to form a shell cavity; the side of the first side plate facing away from the shell cavity is provided with a first working fluid outlet connecting pipe and a first working medium inlet at intervals Connecting pipe; the other side of the first side plate facing away from the shell cavity is provided with a second working fluid outlet connecting pipe and a second working fluid inlet connecting pipe at intervals.

In some embodiments, the heat exchange chip includes a first plate and a second plate arranged at intervals along the first direction, and two internal partitions are arranged between the first plate and the second plate. rings and inner fins, two inner spacers are arranged at intervals along the second direction on both sides of the inner fins; the inner spacers, the inner fins, the first plate and The second plate encloses and forms an inner cavity.

In some embodiments, the first working fluid inlet connection pipe, the inner cavity of the first heat exchange core group, the flange, the first side plate and the first working fluid outlet connection pipe The secondary connection forms the first flow channel; the second working fluid inlet connection pipe, the inner chamber of the second heat exchange core group, the flange and the second working fluid outlet connection pipe are sequentially connected to form the Describe the second channel.

In some embodiments, along the first direction, the flange defines a first opening, the first plate and the second plate define a second opening, and the outer spacer defines a second opening. The third opening; the inner spacer is arranged around the outer peripheral edge of the second opening; the first opening, the second opening, the third opening communicate with the inner cavity.

In some embodiments, each of the first openings is equipped with a sealing ring, and the first working fluid inlet connection pipe, the flange, and the first side plate are sealed by the sealing ring; the first working fluid The outlet connecting pipe, the flange, and the first side plate are sealed by the sealing ring; the second working fluid inlet connecting pipe, the flange, and the other first side plate are sealed by the sealing ring ; The second working fluid outlet connecting pipe, the flange, and the other first side plate are sealed by the sealing ring.

In some embodiments, a third working fluid inlet is opened on one of the second side plates, a third working medium outlet is opened on the other second side plate, the third working fluid inlet, the third working medium The mass outlet communicates with the shell cavity to form the third flow channel.

In some embodiments, a support plate is further included, the support plate is extended in the shell cavity along the second direction, and the first heat exchanging core group and the second heat exchanging core group are disposed away from each other. on both sides of the support plate.

In some embodiments, the opposite sides of the two first side plates are respectively provided with card slots, and the shell cavity is provided with a filter screen at the inlet of the third working fluid, and the filter screen is connected to the support plate , the end of the filter screen away from the support plate is connected to the slot.

In some embodiments, the first working fluid and the second working fluid are high-temperature working fluids, and the third working fluid is cooling working fluid.

The heat exchanger provided by the present invention includes: a shell, the shell is provided with a third flow channel, and the third flow channel is used to provide the third working fluid as a cold source; the first heat exchange core group arranged in the shell away from and the second heat exchange core group, the first heat exchange core group is provided with a first flow channel, the first flow channel is used to provide the first working fluid as a heat source, the second heat exchange core group is provided with a second flow channel, and the second flow channel Used to provide the second working fluid as a heat source; the third flow channel is spaced apart from the first flow channel and the second flow channel; the flow direction of the third working fluid in the third flow channel is respectively the same as the flow direction of the first working fluid in the first flow channel It is opposite to the flow direction of the second working fluid in the second flow channel; the heat exchanger uses the third working fluid to fully cool the first working fluid and the second working fluid, so as to achieve the purpose of using the cooling working fluid to exchange heat for the high temperature working fluid .

Description of drawings

The technical solutions and other beneficial effects of the present invention will be apparent through the detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Fig. 1 is the perspective view of heat exchanger of the present invention;

Fig. 2 is a structural schematic diagram of the heat exchanger shown in Fig. 1;

Fig. 3 is a perspective view of a single heat exchange core group of the heat exchanger shown in Fig. 2;

Fig. 4 is a schematic structural diagram of a single heat exchange core group shown in Fig. 3;

Fig. 5 is a perspective view of a single-layer heat exchange chip in the heat exchange core group shown in Fig. 3;

Fig. 6 is a schematic cross-sectional view of the heat exchange chip shown in Fig. 5;

Fig. 7 is a three-dimensional view of the filter screen of the heat exchanger shown in Fig. 2;

The reference numerals are: 100-shell, 110-first side plate, 120-second side plate, 130-third side plate, 140-shell cavity, 150-support plate, 160-filter screen, 170-installation hole Plate, 200-first heat exchange core group, 300-second heat exchange core group, 210-flange, 220-heat exchange chip, 230-outer fin, 240-outer spacer, 250-end cover, 260- Sealing ring, 221-first plate, 222-second plate, 223-inner fin, 224-inner spacer, 225-inner cavity, 410-first opening, 420-second opening, 430- The third opening, 440-the fourth opening, 510-the outlet of the first working fluid, 520-the inlet of the first working fluid, 530-the outlet of the second working fluid, 540-the inlet of the second working fluid, 550- Import of the third working fluid, 560-export of the third working fluid, 570-grooving.

Detailed ways

The specific implementation of the heat exchanger of the present invention will be described in detail below in conjunction with the accompanying drawings.

Please refer to Fig. 3 to Fig. 7, the present invention provides a heat exchanger, including a housing 100, a first heat exchanging core group 200, a second heat exchanging core group 300, the housing 100 is provided with a third flow channel, the second The three flow channels are used to provide the third working fluid as a cold source, the first heat exchange core group 200 and the second heat exchange core group 300 are arranged in the housing 100 away from each other, and the first heat exchange core group 200 is provided with a first flow channel , the first flow channel is used to provide the first working fluid as a heat source, the second heat exchange core group 300 is provided with a second flow channel, the second flow channel is used to provide the second working fluid as a heat source, and the third flow channel is respectively connected to the first flow channel The flow direction of the third working fluid provided by the third flow channel is opposite to the flow direction of the first working fluid provided by the first flow channel and the flow direction of the second working fluid provided by the second flow channel. The heat exchanger utilizes the third working fluid to fully cool the first working fluid and the second working fluid, thereby achieving the purpose of exchanging heat with the high-temperature medium.

As shown in FIG. 2 , the casing 100 includes two first side plates 110 oppositely arranged along the first direction Y, two second side plates 120 oppositely arranged along the second direction X, and two second side plates 120 oppositely arranged along the third direction Z. Three side plates 130, two first side plates 110, two second side plates 120 and two third side plates 130 enclose to form a hollow structure, wherein the first direction Y, the second direction X and the third direction Z are perpendicular to each other . That is, the casing 100 is a cuboid structure, and the outer part of the first heat exchanging core group 200 , the outer part of the second heat exchanging core group 300 and the hollow structure form a shell cavity 140 .

As shown in FIG. 2 , a support plate 150 is also provided in the shell cavity of the housing 100. The support plate 150 extends along the second direction X and is fixed on the inner wall of the housing 100. The first heat exchange core group 200 and the second heat exchange core group The core group 300 is arranged on the support plate 150 away from the first direction Y, the first heat exchange core group 200 and the second heat exchange core group 300 are placed in opposite directions in the shell cavity 140, and the first heat exchange core group 200 The height is higher than the second heat exchange core group 300, that is, the bottom of the first heat exchange core group 200 and the bottom of the second heat exchange core group 300 are fixedly installed on the support plate 150, and the first heat exchange core group 200 and the second heat exchange core group The heat exchange core group 300 is arranged in parallel in the casing cavity 140 of the casing 100 .

As shown in Figures 2 to 4, the first heat exchange core group 200 and the second heat exchange core group 300 have the same structure, and both the first heat exchange core group 200 and the second heat exchange core group 300 are of plate-fin structure; Any one of the first heat exchange core group 200 and the second heat exchange core group 300 includes a heat exchange chip 220, a flange 210, an outer fin 230, an outer spacer 240 and an end cover 250; a plurality of heat exchange chips 220 Arranged in layers along the first direction Y, two outer spacers 240 and outer fins 230 located between the two outer spacers 240 are arranged between two adjacent heat exchange chips 220, and the two outer spacers 240 are spaced apart along the second direction X It is provided that the sides of the first heat exchange core group 200 and the second heat exchange core group 300 facing away from each other are provided with flanges 210 respectively, that is, the edges of the first heat exchange core group 200 facing one side of the first side plate 110 are respectively provided with flanges 210 . Two flanges 210 are arranged at intervals in the second direction X, and two flanges 210 are arranged at intervals along the second direction X on the side of the second heat exchange core group 300 facing the other first side plate 110 , and the first heat exchange core The sides of the group 200 and the second heat exchange core group 300 are respectively provided with end caps 250 , that is, the heat exchange chips 220 on the side of the first heat exchange core group 200 close to the second heat exchange core group 300 are arranged along the second direction. Two end caps 250 are arranged at intervals X, and two end caps 250 are arranged at intervals along the second direction X on the heat exchanging core 220 of the second heat exchanging core group 300 near the first heat exchanging core group 200 .

The first heat exchange core group 200 or the second heat exchange core group 300 of different heights can be formed with the flange 210 and the end cover 250 by selecting different layers of heat exchange chips 220, outer fins 230, and outer spacers 240, Therefore, the heat dissipation areas of the first heat exchange core group 200 and the second heat exchange core group 300 are also different, so as to meet different heat exchange requirements.

A first working fluid outlet joint 510 and a first working medium inlet joint 520 are arranged at intervals along the second direction X on one first side plate 110 , and second The second working fluid outlet connecting pipe 530 and the second working medium inlet connecting pipe 540; part of the flange 210, end cover 250, outer spacer 240, first working medium inlet connecting pipe 520, and second working medium inlet connecting pipe 540 along the first direction Y Alignment, the flange 210 , the end cover 250 , the outer spacer 240 , the first working fluid outlet joint 510 , and the second working medium outlet joint 530 are aligned along the first direction Y. In addition, as shown in FIG. 2 , the first working fluid inlet connection 520 , the first working fluid outlet connection 510 , the second working fluid inlet connection 540 , and the second working fluid outlet connection 530 are all arranged on the first side plate 110 and all located outside the shell cavity 140 .

As shown in Figure 5 and Figure 6, the heat exchange chip 220 includes a first plate 221, a second plate 222, an inner fin 223 and an inner spacer 224, the first plate 221 is arranged opposite to the second plate 222, The first plate 221 defines two second openings 420 along the first direction Y, and the two second openings 420 are arranged at intervals along the second direction X, and the inner fins 223 and the inner spacers 224 are arranged on each Between the first plate 221 and the second plate 222 of the thermal chip 220, two inner spacers 224 are arranged in the heat exchange chip 220 at intervals along the second direction X, and the inner fins 223 are arranged between the two inner spacers 224 . In each heat exchange chip 220, two inner spacers 224, inner fins 223, the first plate 221 and the second plate 222 enclose to form an inner cavity 225; in each heat exchange chip 220, the first plate 221 It communicates with the second plate 222 through the second opening 420 .

Further, as shown in FIG. 4 , the flange 210 has a first opening 410 along the first direction Y, and the outer spacer 240 has a third opening 430 along the first direction Y, which is equivalent to the heat exchange chip 220 opening along the first direction Y. Y sets two second openings 420, and the two second openings 420 are arranged on the heat exchange chip 220 at intervals along the second direction X, the end cover 250 is installed in the second opening 420 of the heat exchange chip 220, and the flange 210 The first opening 410 communicates with the second opening 420 of the heat exchange chip 220 .

Moreover, the first side plate 110 is connected to the flange 210 of the first heat exchange core group 200, and the first side plate 110 is connected to the flange 210 of the second heat exchange core group 300, and the first side plate 110 is provided with a fourth The opening 440, the first opening 410 of the flange 210 communicates with the fourth opening 440 of the first side plate 110; The inner cavity 225 of the first side plate 110 communicates with the fourth opening 440 to form a first flow channel; the second working fluid inlet connection 540, the second working fluid outlet connection 530, the inner cavity 225 of the second heat exchange core group 300 and The fourth opening 440 of the other first side plate communicates to form a second flow channel.

A plurality of heat exchange chips 220 of the same structure are stacked to form a first heat exchange core group 200 and a second heat exchange core group 300 , and the inner cavity 225 of each layer of heat exchange chips 220 passes through the second opening 420 of the first plate 221 It communicates with the second opening 420 of the second sheet 222, presenting a multi-layer parallel structure. After the first heat exchange core group 200 and the second heat exchange core group 300 are integrally brazed, the inner cavity 225 can only communicate with the outside through the first opening 410 of the flange 210 .

The fourth opening 440 of the first side plate 110 is provided with a sealing ring 260, wherein the first working fluid inlet connecting pipe 520, the flange 210, and the first side plate 110 are connected and sealed through the sealing ring 260; the first working medium outlet connecting pipe 510, the flange 210, and the first side plate 110 are connected and sealed through the sealing ring 260, the second working fluid inlet connecting pipe 540, the flange 210, and the other first side plate 110 are connected and sealed through the sealing ring 260; the second working medium outlet connecting pipe 530 , the flange 210 , and the other first side plate 110 are connected and sealed through the sealing ring 260 .

Therefore, the inner cavity 225 of the first heat exchange core group 200 and the inner cavity 225 of the second heat exchange core group 300 are respectively used as two independent working fluid channels, and the first heat exchange core group 200 and the second heat exchange core group The inlet and outlet of the group 300 are equivalent to the flange 210, which are connected with the first side plate 110 of the housing 100, external connecting pipes such as the first working fluid inlet connecting pipe 520, the first working medium outlet connecting pipe 510, and the second working medium inlet connecting pipe 540. The second working medium outlet connecting pipe 530 is connected in a sealed manner, and the first flow path and the second flow path are different from each other.

As shown in Figure 2, a second side plate 120 of the housing 100 is provided with a third working fluid inlet 550, and the other second side plate 120 of the housing 100 is opened with a third working fluid outlet 560, and the third working fluid inlet 550 , the third working medium outlet 560 communicates with the shell cavity 140 to form a third flow channel.

As shown in Figure 1, the opposite sides of the two first side plates 110 of the housing 100 are provided with card slots respectively, and a filter screen 160 is provided in the shell cavity 140 of the housing 100, and the filter screen 160 is detachably arranged in the third working At the quality inlet 550, the filter screen 160 is connected to the support plate 150 in a fixed connection, and the end of the filter screen 160 away from the support plate 150 is connected to the slot of the first side plate 110, that is, the end of the filter screen 160 away from the support plate 150 It is fixed in the slot of the first side plate 110 . It should be noted that the overall outline size of the filter screen 160 is smaller than the opening size of the third working fluid inlet 550 of the second side plate 120, as shown in Figures 1 and 2, the filter screen 160 can be fed by the third working fluid inlet 550 is put into the housing cavity 140, so that the filter screen 160 can be replaced regularly subsequently. In addition, the two third side plates 130 are respectively provided with slots 570 , the slots 570 can enhance the strength of the housing 100 and reduce the short circuit of the cooling fluid in the shell cavity 140 .

As shown in Figure 7, the filter screen 160 has a mesh, and the outer fins 230 have channels, and the mesh diameter of the filter screen 160 is less than or equal to the minimum channel size of the outer fins 230, so as to prevent impurities in the third working fluid from passing through the filter screen 160 blocks the third flow channels of the first heat exchange core group 200 and the second heat exchange core group 300 . In addition, the filter screen 160 is made of stainless steel or copper, which has good seawater corrosion resistance, and the material of the shell 100 is brass material with good seawater corrosion resistance, such as tin brass material, which can improve the heat transfer. Seawater corrosion resistance of the device. The materials of the first heat exchange core group 200 and the second heat exchange core group 300, that is, the materials of the heat exchange chip 220, the outer fin 230, the outer spacer 240, the end cover 250 and the flange 210 are all selected from cupronickel material, with Good seawater corrosion resistance and brazing function can effectively improve the reliability of the heat exchanger and prolong its service life. In addition, the two first side plates 110 are respectively provided with mounting hole plates 170 , and the mounting hole plates 170 are provided with through holes.

It should be understood that, in any one of the first heat exchanging core group 200 and the second heat exchanging core group 300, the inner cavity 225 of each heat exchanging chip 220 is independent of each other, and the inner cavity 225 is respectively connected to the first flow channel, the second The flow channel is connected; the shell cavity of the housing 100 communicates with the third working medium inlet 550 of the second side plate 120 and the third working medium outlet 560 of the second side plate 120 to form a third flow channel; when the heat exchanger is working, The first working fluid flows through the first flow channel of the first heat exchange core group 200, the second working fluid flows through the second flow channel of the second heat exchange core group 300, and the third working fluid flows through the third flow channel to realize The purpose of the third working fluid to simultaneously cool the first working fluid and the second working fluid. Further, in order to improve the heat exchange effect, the flow direction of the third working fluid is opposite to the flow direction of the first working fluid and the second working fluid respectively. The flow direction of the mass generally adopts the convective flow direction. In this embodiment, the first working fluid and the second working fluid are high-temperature working fluids, and the third working fluid is cooling working fluid.

The heat exchanger of the present invention includes a housing 100, and a third flow channel is provided in the housing 100, and the third flow channel is used to provide a third working fluid as a cold source; The heat exchange core group 200 and the second heat exchange core group 300, the first heat exchange core group 200 is provided with a first flow channel, the first flow channel is used to provide the first working fluid as a heat source, and the second heat exchange core group 300 is provided with a first flow channel Two flow channels, the second flow channel is used to provide the second working fluid as a heat source; the third flow channel is spaced apart from the first flow channel and the second flow channel respectively; The flow direction of the working fluid in the first flow channel is opposite to the flow direction of the second working fluid in the second flow channel; the heat exchanger uses the third working fluid to fully cool the first working fluid and the second working The purpose of heat exchange with high temperature working fluid. The heat exchanger of the present invention adopts a modular and combined design, and has the characteristics of compact structure, small volume, light weight, high heat exchange efficiency, etc., and the heat exchanger can also satisfy the cooling function of two high-temperature working fluids at the same time.

The above is only the heat exchanger of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as part of the present invention. protected range.

Claims (11)

1. A heat exchanger, characterized in that, comprising: A housing (100), the housing (100) is provided with a third flow channel, and the third flow channel is used to provide a third working fluid as a cooling source; facing away from the first heat exchange core group (200) and the second heat exchange core group (300) arranged in the casing (100), the first heat exchange core group (200) is provided with a first flow channel, The first flow channel is used to provide the first working fluid as a heat source, and the second heat exchange core group (300) is provided with a second flow channel, and the second flow channel is used to provide the second working fluid as a heat source; Wherein, the third flow channel is spaced apart from the first flow channel and the second flow channel respectively; the flow direction of the third working fluid in the third flow channel is the same as that of the first working fluid in the The flow direction in the first flow channel is opposite to the flow direction of the second working fluid in the second flow channel. 2. The heat exchanger according to claim 1, characterized in that, any one of the first heat exchange core group (200) and the second heat exchange core group (300) includes (Y) A plurality of heat exchange chips (220) stacked and arranged, and outer fins (230) and two outer spacers (240) are arranged between adjacent heat exchange chips (220), and the outer spacers ( 240) are arranged at intervals on both sides of the outer fin (230) along the second direction (X), and the first heat exchange core group (200) and the second heat exchange core group (300) are away from each other Flanges (210) are respectively provided on one side, and end covers (250) are respectively provided on the sides where the first heat exchange core group (200) and the second heat exchange core group (300) are close to each other. 3. The heat exchanger according to claim 2, characterized in that, the housing (100) includes two first side plates (110) arranged at intervals along the first direction (Y), and two first side plates (110) along the first direction (Y). The two second side panels (120) arranged at intervals in the two directions (X), the two third side panels (130) arranged at intervals along the third direction (Z), the two first side panels (110), the two The second side plate (120) and the two third side plates (130) enclose to form a hollow structure; wherein, the first direction (Y), the second direction (X) and the third direction ( Z) Two pairs are perpendicular to each other; Moreover, the first heat exchange core group (200) and the second heat exchange core group (300) are arranged between the two first side plates (110), and the first heat exchange core group (200 ), the outside of the second heat exchange core group (300) and the hollow structure are enclosed to form a shell cavity (140); One side of the first side plate (110) facing away from the shell cavity (140) is provided with a first working fluid outlet connecting pipe (510) and a first working medium inlet connecting pipe (520); the other said first The side of the side plate (110) facing away from the shell cavity (140) is provided with a second working fluid outlet joint (530) and a second working fluid inlet joint (540) at intervals. 4. The heat exchanger according to claim 3, characterized in that, the heat exchange chip (220) comprises a first plate (221) and a second plate arranged at intervals along the first direction (Y) (222), two inner spacers (224) and inner fins (223) are arranged between the first plate (221) and the second plate (222), and the inner spacer (224) Arranged on both sides of the inner fin (223) at intervals along the second direction (X); the inner spacer (224), the inner fin (223), the first plate ( 221) and the second plate (222) enclose to form an inner cavity (225). 5. The heat exchanger according to claim 4, characterized in that, the first working fluid inlet connecting pipe (520), the inner cavity (225) of the first heat exchanging core group (200), the The flange (210), the first side plate (110) and the first working fluid outlet connecting pipe (510) are sequentially connected to form the first flow channel; the second working medium inlet connecting pipe (540), The inner cavity (225), the flange (210) and the second working fluid outlet connection (530) of the second heat exchange core group (300) are connected in sequence to form the second flow channel. 6. The heat exchanger according to claim 4, characterized in that, along the first direction (Y), the flange (210) defines a first opening (410), and the first plate The sheet (221) and the second plate (222) are provided with a second opening (420), and the outer spacer (240) is provided with a third opening (430); the inner spacer (224) is wound around the The peripheral edge of the second opening (420); the first opening (410), the second opening (420), the third opening (430) and the inner cavity (225) connected. 7. The heat exchanger according to claim 6, characterized in that, each of the first openings (410) is equipped with a sealing ring (260), the first working fluid inlet connecting pipe (520), the The flange (210) and the first side plate (110) are sealed by the sealing ring (260); the first working fluid outlet connecting pipe (510), the flange (210), and the first side plate (110) is sealed by the sealing ring (260); the second working fluid inlet joint (540), the flange (210), and the other first side plate (110) pass through the sealing ring ( 260) sealing; the second working fluid outlet connecting pipe (530), the flange (210), and the other first side plate (110) are sealed by the sealing ring (260). 8. The heat exchanger according to claim 3, characterized in that, one of the second side plates (120) is provided with a third working fluid inlet (550), and the other of the second side plates (120) is provided with There is a third working fluid outlet (560), the third working fluid inlet (550), the third working fluid outlet (560) communicate with the shell cavity (140) to form the third flow channel. 9. The heat exchanger according to claim 8, further comprising a support plate (150), the support plate (150) extending along the second direction (X) and arranged in the shell cavity (140) ), the first heat exchange core group (200) and the second heat exchange core group (300) are arranged on both sides of the support plate (150) away from each other. 10. The heat exchanger according to claim 9, characterized in that, the opposite sides of the two first side plates (110) are respectively provided with card slots, and the shell cavity (140) is located between the third working fluid A filter screen (160) is provided at the inlet (550), the filter screen (160) is connected to the support plate (150), and the end of the filter screen (160) away from the support plate (150) is connected to the card slot connection. 11. The heat exchanger according to claim 10, wherein the first working fluid and the second working fluid are high-temperature working fluids, and the third working fluid is cooling working fluid.

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